Conor McGregor promises to knock out Floyd Mayweather while wearing ‘f--- you’ suit at first press conference for megafight

The press tour for the Floyd Mayweather-Conor McGregor boxing match began on Tuesday as one would expect: Expletives flew, verbal jabs were thrown and each fighter boasted that he would win the fight easily.

"He is f----d. There's no other way about it," McGregor said of Mayweather, the career 49-0 boxer. "His little legs, his little core, his little head - I'm gonna knock him out inside four rounds, mark my words."

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To further prove his point, McGregor let his suit do the talking.

He wore a unique pinstripe suit with the stripes consisting of the words "f--- you" in white font instead of simple lines.

Floyd Mayweather is coming out of retirement for the fight, having last boxed on Sept. 12, 2015. (Jae C. Hong/AP)

Expect more of the same up until the two meet in a mega-fight on Aug. 26 in Las Vegas. The pomp and circumstance began before a pro-McGregor crowd at Staples Center in Los Angeles, kicked off with a performance by Aloe Blacc, and will continue this week Wednesday in Toronto, Thursday in Brooklyn and Friday in London.

McGregor came across as a natural and more genuine, while Mayweather's remarks seemed more orchestrated. Perhaps his most biting line came when he took a shot at McGregor for losing by submission to Nate Diaz at UFC 196.

"We know Mr. Tap-out like to quit, and you will wave that white flag," Mayweather said. "Are you going out on your face or going out on your back?"

Mayweather is coming out of retirement for the fight, having last boxed on Sept. 12, 2015 when he defeated Andre Berto by unanimous decision. McGregor's last MMA fight was the MSG in November when he defeated Eddie Alvarez at UFC 205 by TKO to win the Lightweight championship. At the time he was still Featherweight champion and became the first UFC fighter ever to hold titles in two different weight classes.

McGregor took a shot at Mayweather's tax issues. The IRS says Mayweather owes $22.2 million in taxes from 2015, according to the Associated Press.

"He's in a f---g tracksuit. He can't even afford a suit anymore," McGregor said.

Mayweather later had this retort: "I'm the IRS, and I'm gonna tax your ass."

McGregor said he wasn't fazed by entering the boxing realm to make the fight happen and didn't care that 10 oz. gloves were requested. Mayweather then claimed he didn't care how heavy the gloves were or whether the fight took place in a ring or an octagon, prompting McGregor to yell at him from his chair that he did care.

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The Irish MMA fighter discussed the greater restrictions of a boxing match and said it was "half a fight, a quarter of a fight." He added "If this was a true fight, it wouldn't even take one round."

At the end the two had a classic face-to-face pose and continued to spit venom at one another, an act they'll show three more cities this week, six weeks out from what's expected to be the most-purchased pay-per-view fight ever.